SOLUTION: The scores on a sociology exam are normally distributed with a mean of 70 and a standard deviation of 10. If the instructor assigns As to 15%, Bs to 25%, Cs to 40%, Ds to 15%, Fs t

Question 933052: The scores on a sociology exam are normally distributed with a mean of 70 and a standard deviation of 10. If the instructor assigns As to 15%, Bs to 25%, Cs to 40%, Ds to 15%, Fs to 5% of the class, find the cutoff point for grades A-D.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The scores on a sociology exam are normally distributed with a mean of 70 and a standard deviation of 10. If the instructor assigns As to 15%, Bs to 25%, Cs to 40%, Ds to 15%, Fs to 5% of the class, find the cutoff point for grades A-D.
------
I'll do the score for A::
invNorm(0.85) = 1.0364
----
Corresponding score using x = z*s + u
Cut-off score = 1.0364*10+70 = 80.36
-------
Cheers,
Stan H.
----------------
RELATED QUESTIONS
The scores on an exam are normally distributed, with a mean of 77 and a standard... (answered by Edwin McCravy)

The class exam results were normally distributed, with a mean of 80 and standard... (answered by reviewermath)

The scores on an exam are normally distributed, with a mean of 79 and a standard... (answered by rapaljer)

The scores on an exam are normally distributed, with a mean of 77 and a standard... (answered by scott8148)

If the scores on a certain exam are normally distributed with a mean of 79 and a standard (answered by amarjeeth123)

A set of exam scores is normally distributed with a mean = 74 and standard deviation = 4. (answered by Theo)

A professor finds that the scores on a History exam are known to be normally distributed... (answered by stanbon)

The achievement scores for a college entrance examination are normally distributed with a (answered by stanbon)

The scores on a lab test are normally distributed with mean of 200. If the standard... (answered by stanbon)